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L. 'A ROSETT', Deod.

(No Model.)

M. ROSETT, Executor.

ENVELOPE.

No. 537,365; Patented Apr. 9, 1895.

INVENTOH fiw BY WITNESSES:

ATTORNEYS.

ENE 00 rmoTo-Lmw WAsPHNGTON, 04 c NITED STATES PATENT. OFFICE.

LOUlS .A. ROSETT, OF NEW YORK, N. Y.; MORITZ ROSETT EXEOUTOR OF SAID LOUISA. ROSETT, DECEASED.

ENVELOPE.

SPECIFICATION forming part of Letters IEatent No. 537,365, dated April 9, 1 895.

Application filed September so, 1893. Serial No. 486,860. (No model.)

To aZZ whom it may concern.-

Be it known that I, LOUIS A. ROSETT, of the city, county, and State of New York, have invented certain new and useful Improvements in Envelopes, of which the following is a full, clear, and exact description.

My invention relates to improvements in envelopes, and especially to that class of envelopes which are used for carrying valuable or registered packages. It has been found almost impossible to made an envelope which could not be opened by steaming or other means and then rescaled, and the object of my invention is to obviate this difficulty, which I do by constructing an envelope with all the seams double and by arranging the fastening flap, together with certain fastening tabs, in such a way that they hold the envelope securely closed, and so that if once loosened they cannot be again fastened without revealing the fact that the envelope has been tampered with.

To these ends my invention consists in an envelope, the construction of which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a plan view of the blank from which my envelope is formed. Fig. 2 is a rear View of the envelope with the fastening flap open; and Fig. 3 is a rear view of the envelope with the fastening flap secured to the body of the envelope to seal the same.

The envelope blank 10 is provided with projecting end flaps 11 which are adapted to be folded inward on the lines 12, see Fig. 1, and thus form the envelope body, the length of the flaps being such that when folded inward they will overlap so as to make a strong seam, as shown at 13 in Fig.2. The envelope is provided with side or bottom and top flaps 14 and 15, the former being adapted to fold upward and inward over the flaps 11 to which it is securely gummed, and the tip of the flap 14 is cut off, as shown at 16, although this is not essential. diagonal edges, as shown.

The envelope is folded on the lines 17 and The lower flap 14 is cut to have 18, see Fig. 1, and this causes the upper and line 18, however, until the package has been inserted in it and the envelope is to be sealed. The flap 15 is then doubled over the back of the envelope in the usual way, except that the fold is made along the line 18 so as to make the double seam at the top, and the flap 15 is provided, at its free edges, with diverging tabs 19 which are adapted to overlap the edges of the flap 14 and be pasted to the flap and to the adjacent body portion of the envelope, as shown in Fig. 3.

The point of the flap 15 is adapted to overlap the central portion of the flap 14, and it will be observed by reference to Fig. 3, that when the flap 15 is fastened down there will be three projecting points on the flap, to wit: the central point of the flap and the two tabs 19, extending in different directions to cover the diagonal edges of the lower flap 14, and it the flap is to be tampered with, that is, loosened by steaming or other means, it will be necessary to bring all three of these points back to their original position when the envelope is rescaled, and this is practically an impossibility, so that if the envelope is surreptitiousl y opened, the fact will be made evident by the displacement of one or more of said projecting points.

It will be noticed that the tabs are projected from the diagonal edges of the top and are elongated in a direction corresponding to the diagonal joints between the lower and side flaps so that when folded, the tabs will overlie and extend along said diagonal joints strengthening and bracing the same longitudinally for a considerable distance along their lengths.

When the envelope is sealed it is desirable to place the wax seals on both tabs 10, as this renders the opening of the envelope much more difficult than it a single seal were applied to the tip of the flap 15.

Having thus described my invention, 1' claim as new and desire'to secure by Letters Patent- ICO An envelope having a diagonal joint bethe said tabs will overlie and extend along" tween its lower flap and side flaps having its said diagonal joints, substantially as and for top flap formed with diagonal edges and prothe purposes set forth.

vided with tabs projecting from the said di- LOUIS A. ROSETT. 5 agonal edges and elongated in adireetion cor- Witnesses:

responding to the diagonal joints between the WARREN B. HUTGHINSON,

lower and side flaps whereby when folded O. SEDGWICK. 

